“It comes down to niche to break the American individualism and lack of societal constraints. Add careerism, and you see why the incentives for men go way down. Working and careers take women out of their looks and fertility prime, raises their expectations, simultaneously not "needing" men until it's too late because the whole entering the workplace game has been played to the economy's (globalist and statist) endgame.
The issue with niche is that if you find a "religious" girl, she is still in the bad culture. And how many of those girls are truly devoted and out of the culture to a meaningful degree? Few.
No one wants to say it, but it comes down to selection pressures on women being very low when there is no dependence on men. Currently, there aren't many at all. Society is structured to take care of them, resource and safety wise. The problem is that we didn't evolve in that environment, so biology is still there but civilizational stability isn't because at least in the West, consumerism and the economics-over-everything mentalities put all the other desirable qualities to third tier. That same economy uber alles led to many other feedback reinforcers, immigration, lower wages across the board, less social harmony, etc.
The amusing (and sad) thing is that the older you get, you paradoxically need a younger and younger wife, or it all makes less sense, since as a male you do better and are wiser, and what's the point otherwise? If you are solid and have resources and intelligence or wisdom, why would you get involved with someone unless to have a family with someone on that same page? Yet you are prompted by others to take the rapidly washed up off the shelves, even at your successful state. No, they wont' know anything about SMV being way higher for men post 30 and women a rapidly diminishing return. That would requite honesty about biology, not something en vogue right now.
The near entirety of human existence understood these biological laws of men and women. In the last 50 years, they suggest that we somehow changed and should just forget the past. The quintessential idiocy comes out (not that anyone really buys it) in slogans like "The future is female."
But modern people are "smarter". Yet somehow they can't figure out that we're here because of what our ancestors did before us.